[PATCH v2] app/test-crypto-perf: fix invalid mbuf next operation

[Suanming Mou]

In fill_multi_seg_mbuf(), when remaining_segments is 0,
rte_mbuf m's next should pointer to NULL instead of a
new rte_mbuf, that causes setting m->next as NULL out
of the while loop to the invalid mbuf.

This commit fixes the invalid mbuf next operation.

Fixes: bf9d6702eca9 ("app/crypto-perf: use single mempool")

Signed-off-by: Suanming Mou <suanmi...@nvidia.com>
---

v2: move next_mbuf inside remaining_segments check.

---
 app/test-crypto-perf/cperf_test_common.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/app/test-crypto-perf/cperf_test_common.c 
b/app/test-crypto-perf/cperf_test_common.c
index 932aab16df..b3bf9f67e8 100644
--- a/app/test-crypto-perf/cperf_test_common.c
+++ b/app/test-crypto-perf/cperf_test_common.c
@@ -49,7 +49,6 @@ fill_multi_seg_mbuf(struct rte_mbuf *m, struct rte_mempool 
*mp,
 {
        uint16_t mbuf_hdr_size = sizeof(struct rte_mbuf);
        uint16_t remaining_segments = segments_nb;
-       struct rte_mbuf *next_mbuf;
        rte_iova_t next_seg_phys_addr = rte_mempool_virt2iova(obj) +
                         mbuf_offset + mbuf_hdr_size;
 
@@ -70,15 +69,15 @@ fill_multi_seg_mbuf(struct rte_mbuf *m, struct rte_mempool 
*mp,
                m->nb_segs = segments_nb;
                m->port = 0xff;
                rte_mbuf_refcnt_set(m, 1);
-               next_mbuf = (struct rte_mbuf *) ((uint8_t *) m +
-                                       mbuf_hdr_size + segment_sz);
-               m->next = next_mbuf;
-               m = next_mbuf;
-               remaining_segments--;
 
+               remaining_segments--;
+               if (remaining_segments > 0) {
+                       m->next = (struct rte_mbuf *)((uint8_t *) m + 
mbuf_hdr_size + segment_sz);
+                       m = m->next;
+               } else {
+                       m->next = NULL;
+               }
        } while (remaining_segments > 0);
-
-       m->next = NULL;
 }
 
 static void
-- 
2.34.1